Gauge



E. E. HMM@ ET mm GAUGE Filed April zo, '1925 2 sheets-sheet .2

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Application ated April 99, 11999. hei-tal llo. M5999.

'lihis invention relates to gauges and is directed more particularly to pressure gauges ot the Bourdon type.

IThe primary object ot' the present invention is to provide a pressure gauge which is particularly simple in construction, inexpensive to manufacture, durable and elhcient in use and which is light in weight.

Another object is to provide a pressure gauge wherein the entire assembly is supported as a unit by the inlet nipple, thus avoiding any danger ot warping the various elements thereot1 when fastening the same in the case.

A further object is to provide a gauge `wherein the dial is fastened in place by' means ot two stop pins located one adjacent each end of the graduated'portion ci the dial, such stop pins serving also to limit the movement ot the indicating needle and the radial movement ot' the Bourdon tube.

A iturther objectnt the invention is to provide a gauge ot the character described which is particularly adapted tor use with automobiles and in which the worlring parts are supb ported by the inlet nipple or socket,

A further object of the invention is to rovide a gauge in which the casing .in ich the working parts are enclosed is -rovided with an opening in its rear wall o set with i'espect'to the center thereot whereby the Bourdon tube may be secured directly to the inlet nipple thus obviating the necessity tor providing bores or passageways lor connecting the inlet nipple with the Bourdon tube.

A still further object ot the invention is to provide a gauge ot the 'class -described which eliminates the necessity tor' metal castings and in which the inlet nipple is made trom a product ot'ascrew machine and thef plate tor securing the nipple to the casing is a metal stamp-ing whereby to better adapt the device torquantityproduction at cornparatively low costs.

A still turther object is to provide a gauge ot the aforesaid character which shall include novel means l-or tastening the gauge unit in the casing so .as to re uire only one tasteiiing screw but which shal etlectively prevent rotation oit the unit with respect to the casing.

With these and other objects in view, the

4invention consists in the various novel tea tures ot construction and arrangement or cobination, all ot which will be tully described hereinatter appended claims., lin the drawings ing part ol this a plication, lFig. l is a trout' elevation ot a gaugefconstructed in accordance with our invention; lliig. 2 is a top plan view thereof; Fig. 3 is van enlarged vertical sectional view talren on the line 3--9 ot Fig.. A; Big. t is a vertical sectional view through the gauge casin but showing the interior mechanism in si e elevation ,r lEig. 5 is a horizontal sectional view through the auge casing but showing the interior mec anism in bottom planview; Big. 6 is a vertical sectional view taken on the line 6-6 ol Big. 3; Big. 't' is a vertical sectional view taken on the line -7 ot liig. 5; Fig. 8 is a detail sectional view through the inlet, nipple showing the Bourdon tube attached thereto; Big. 9 is a detail sectional viewl ot a modified form ot construcl a detail viewpartly in secv tion; and 1F ig. 10 is tion and partly modihcation.

Describing the various characters, l denotes the serves as the support tor the gauge mechanism to be described in detail hereinafter. This inlet nipple is preferably formed with a tapered seating portion 2 at one end, a threaded portion 3 adjacent said end, and a reduced extension 4t which terminates in a reduced prismatic portion 5. A bore 6 entends trom the end adjacent the seatingportion 2 to a point adjacent the prismatic portion 5 as clear-l shown in Big. 6l Due to the shape ot the inlet nipple, it may be easily and quickly toimcd as a screw machine product and can be turned out in large quantities at a relatively small cost.

A Bourdon tube 6, having the usual arcuate shape is tastenedto the reducedeatension A ot the inlet nipple by bending-one end oit' said tube to dehne an eye 9 whose diameter is in elevation ot a lurther partsvby reference inlet nipple which substantially equal to the diameter ol-entension A. l The eye 9 is slipped over the'extension l and these two .elements are then tastened together by solder or other suitable lastening means. Communication is then established between bore 6 oit the nipple and the Bourdon tube by drilling through the tube Milli and nipple as indicated at l0., whereupon the aperture in the outer wall oit'the tube is closed bya drop ot solder ll or other suible plug.

ounted on the prismatie end h ot the nipaccompanying and torm- All lill

ple is a bracket 14 which may bea stamping from sheet metal and of a shape similar to that shown in Fig. 7. This bracket is preferably formed with diametrically extending arms 15 and 16 and upwardly extending arms 17 and 18, the arm 17 having an extension 19 arranged parallel with arm 18. A second bracket 20, also in the form of a sheet metal stamping, is arranged in spaced parallel relation to bracket 14 and fastened thereto by screws 21 threaded into posts 22 which project from arms 15 and 16. The bracket 20 is of a shape similar to that shown in Fig. 3 and consists essentially of an arm 23 extending between posts 22 and a second arm 24 arranged atright angles thereto and overlying arm 17 of bracket 14.

J ournaled between the brackets 14 and 20 is a spindle 26 which carries a pinion 27 and the outer reduced ends of the spindle project through suitable apertures in the brackets, the end projecting through bracket 14 having an indicating needle 28 affixed thereto. A coiled hair spring 29 has the inner end thereof fastened to spindle 26 and the outer end positioned in a groove 30 formed in one of the posts 22 and fastened thereto by dele'cting the walls of the groove over the end of the spring. i A second spindle 32 is journaled between arms 17 and 24- of brackets 14 and 20 and this spindle carries a lever 33 having a segmental gear 34 at one end which is -meshed with pinion 27, while the opposite end of said lever is formed with a slot 35. The free end of Bourdon tube 8 is closed and revided with an arm 37 which is preferably `ormed with a U-shaped bend 38 and a hooked end 39 that is en aged in slot 35 of lever 33.

suitable dial 40, having a graduated scale 41 on the front thereof, is fastened to arms 18 land 19 of bracket 14, by stop pins 42 which are riveted thereto. These stop pins in addition to providing a simple and inexpensive fastening means for the dial, also serve as stops'for minimum and maximum positions of the indicating needle 28 and prevent excessive distortion of the Bourdon tube due to an excessive pressure being applied to the au e.

g Agplate 45 is fastened to the inlet nipple against the shoulder defined by the threaded portion 3 and the reduced extension 4, and this plate is formed with a threaded aperture 46 and a lug 47.

From the foregoing description, it will be obvious that the entire gauge mechanism is supported and carried by the inlet nipple 1. This unit is easily and quickly fastened in a sheet metal cup shaped casing 48 by entering the threaded portion of the nipple through a slightly elongated opening 49 in the rear wall of the casing and then seating the lug 47 in an aperture 50 formed in the side wall of the casing, whereupon threaded aperture 46 in plate 45 will align with an opening in the aeeaeie rear wall of the casing to receive a fastening screw 51. p A suitable glass front 53 is applied to casing 48 to protect the indicating needle and exclude foreign matter. The gauge is fastened in position by any suitable arrangement, as for instance, by means of a U shaped clamp bar 54 which is engaged over threaded studs 55 that project from the rear wall of casing 48. By tightening nuts 56 applied to studs 55, the bar 54 will be forced against the rear side of the instrument board 57 or other suitable support. A conduit, not shown, connects in the `usual manner with the threaded portion of the inlet nipple so that fluid will be conducted to the gauge.

ln operation, fluid will enter bore 6, thence through bore 10 to the Bourdon tube 8, causing the tube to tend to straighten in proportion to the pressure of the iiuid therein. The arm 37 connected to the free end of the tube ywill exert. a pull on lever 33 which in turn will rotate pinion 27 and indicating needle 28 a proportional distance. When the pressure is relieved, hair spring 29 will return the parts to normal position.

When assembling the gauge, a zero correction for the indicating needle may be easily and quickly made by inserting a screw driver or other instrument in the U shaped bend of arm 37 and spreading said bend to increase the length of the arm, or by closing up U shaped bend 38, the effective length of the arm may be shortened. By reason of the pin and slot connection between arm 37 and lever 33, the end of the tube 8 is free to move without binding and hence an accurate reading means for the plate 45. In this instance the inlet nipple 1a is formed of two parts press fitted or sweated together and consisting of a threaded portion 3a having a recess therein to receive a reduced rod 4, the. effect being the sameas the inlet nipple previously described. In this view is also illustrated a modified fastening for plate 45 which is carried by the threaded portion 3a of the ni le, and the lower end whereof is engage tween the rear wall of the casing 48 and a lug 60 struck up from the side wall of such casing. In other respects the gauge is identical with that previously described.

In Fig. .10 we have shown a further modiication wherein the inlet nipple is provided with a prismatic portion 61, adjacent the innettare ner end ol threaded rtion 3l, which is nip-ple having a threaded portion and a rettl duced extension, a bracket carried by said reduced extension, a second bracket connected to and arran ed inA spaced relation to the iirst bracket, a splndle journaled in said brackets, an indicating needle connected to said spindle, a graduated dial'disposed in operative relation to said indicating needle, sto pins disposed adjacent each end ot the gra uated portion oil said dial, said stopI pins serving to support said dial trom the first mentioned racket, a Bourdon tube having one end con-1 nected to said reduced extension, and means connecting the opposite end ot said tube with said spindle, saidmeans including a bendable element to provide a zero correction tor said needle. y

2. A gauge mechanism comprising a casing having an aperture in the rear wall and a second aperture in the side wall, a gauge unit adapted to be disposed within said casing, said unit having an inlet nipple'adapted to project through the aperture 1n said rear wall, a plate carried by said nipple and having a lug adapted to project through the aperture-- in said side wall, and additional means tor lastening said unit in said casing.

3. A gauge mechanism comprising a casing having an aperture in the rear wall and a second aperture in the side wall, a gauge unit adapted to be' disposed within said casing,

said unit having au inlet nipple adapted to v proj ect through the aperture in said rear wall,

`a plate carried by said nipple and having a lug adapted toproject through the aperture in said side wall, and a screw extending throu h the rear wall ot said Ncasing and threa ed into said plate.

Ll- A gauge mechanism comprising an inlet nipple having a threaded portion, -a prismatic end formed thereon, a sheet metal bracket tastened to said prismatic end, a second sheet metal bracket carried by the rst bracket vand arranged in spaced relation with respect thereto, a spindle journaled between said brackets and having a pinion gear thereon, an-

indicating needle carried by said spindle, a sheet metal lever journal-led between said brackets, said lever having a segmental gear at one end meshed with said pinion, the opposite end 0l said lever having a slot termed therein, a Bourdon tube supported by and connected with said inlet nipple, and a bendable arm extending from thetree end of said tube and engaged in the slot in said lever.

.5. A gauge unit oirn the class described comprising a casing having an opening in its rear avail, gauge mechanism arranged withinisaid lcasing and including a plate having an opening therein adjacent one edge thereof, an inlet nipple secured within the opening in said plate and having a portion extending inwardly through said plate and into said casing, a Bourdon tube secured to and supported by said inwardly extending portion, said plate having a portion disposed in interlocking engagement with said casing, additional means tor securing said plate against relative movement with respect to said casing, said nipple having a bore therein and said tube and nipple having registerin apertures connecting the interior oi said tu e with said bore.

lin testimony whereof, we hereunto ax our signatures.

. lElDll/lUND l. HANS.

HUBERT HENRY.

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